论述了各种同步误差的来源，分析了引入各种同步误差后对回波相位的影响；
The sources of variant synchronization errors are discussed, the analysis of echo phase effected by variant errors is given.
本文报道了一种基于脉冲回波相位谱的超声波速度测量方法，并给出了它的详细理论推导过程。
This paper presents the development of a pulse-echo measurement method, based on the use of a phase spectrum to determine the ultrasonic wave velocity. A detailed descripsion of the theory is given.
利用电离层垂直探测中的组合脉冲控制和回波相位测量分析方法，开发并实现了一种电离层扰动观测模式。
This paper presents and realizes an ionospheric disturbance observation mode by using combinational pulses control and echo's phase measurement analysis in ionospheric vertical sounding.
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